Revert of Delete CompositingUpdateAfterLayout

Source/core/rendering/compositing/RenderLayerCompositor.cpp

Index: Source/core/rendering/compositing/RenderLayerCompositor.cpp
diff --git a/Source/core/rendering/compositing/RenderLayerCompositor.cpp b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
index 0203c9ae313ae21e8c066bdff59e005ebbd81163..cb55062f69ab3230c78a54d638a0344812a68be0 100644
--- a/Source/core/rendering/compositing/RenderLayerCompositor.cpp
+++ b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
@@ -256,23 +256,23 @@
 void RenderLayerCompositor::setNeedsCompositingUpdate(CompositingUpdateType updateType)
 {
     ASSERT(updateType != CompositingUpdateNone);
+    // FIXME: Technically we only need to do this when the FrameView's isScrollable method
+    // would return a different value.
+    if (updateType == CompositingUpdateAfterLayout)
+        m_rootShouldAlwaysCompositeDirty = true;
+
+    // FIXME: This function should only set dirty bits. We shouldn't
+    // enable compositing mode here.
+    // We check needsLayout here because we don't know if we need to enable
+    // compositing mode until layout is up-to-date because we need to know
+    // if this frame scrolls.
+    if (!m_renderView.needsLayout())
+        enableCompositingModeIfNeeded();
+
     m_pendingUpdateType = std::max(m_pendingUpdateType, updateType);
+
     page()->animator().scheduleVisualUpdate();
     lifecycle().ensureStateAtMost(DocumentLifecycle::LayoutClean);
-}
-
-void RenderLayerCompositor::didLayout()
-{
-    // FIXME: Technically we only need to do this when the FrameView's
-    // isScrollable method would return a different value.
-    m_rootShouldAlwaysCompositeDirty = true;
-    enableCompositingModeIfNeeded();
-
-    // FIXME: Rather than marking the entire RenderView as dirty, we should
-    // track which RenderLayers moved during layout and only dirty those
-    // specific RenderLayers.
-    rootRenderLayer()->setNeedsToUpdateAncestorDependentProperties();
-    setNeedsCompositingUpdate(CompositingUpdateAfterCompositingInputChange);
 }
 
 #if ASSERT_ENABLED
@@ -346,6 +346,12 @@
 
     GraphicsLayerUpdater::UpdateType graphicsLayerUpdateType = GraphicsLayerUpdater::DoNotForceUpdate;
     CompositingPropertyUpdater::UpdateType compositingPropertyUpdateType = CompositingPropertyUpdater::DoNotForceUpdate;
+
+    // FIXME: Teach non-style compositing updates how to do partial tree walks.
+    if (updateType >= CompositingUpdateAfterLayout) {
+        graphicsLayerUpdateType = GraphicsLayerUpdater::ForceUpdate;
+        compositingPropertyUpdateType = CompositingPropertyUpdater::ForceUpdate;
+    }
 
     RenderLayer* updateRoot = rootRenderLayer();